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If this is a game which feeds a television monitor, the first thing to check is the cables between the game and the television or monitor. Likely there is a mismatch of cabling. The jacks from the game are not the same type of jacks at the monitor. If the game feeds composite video down one cable and it is plugged into the jack which accepts component video, the cables for the color are Pb and Pr or similar lettering.The monitor is looking for color information and is not receiving it from the game. Check the cables at each end to make sure there is a match in the outputs of the game to the inputs of the monitor.
How old is your monitor? If it's an LCD type with 5 to 9 years of age then it may have burned out lighting inside of it. You would just replace the monitor. Check the back of the monitor for the date. If 2004 or earlier then you need a new monitor. You did say the video comes up to desktop, so it's not the video card, and the pc booted up so it's not the cpu either. I've had this problem too.
You have an incompatability between the drivers and Windows. Uninstall the games. Is everything all right now? Upgade your video and sound drivers. You can download these from the manufacturers web site. Now reinstall the games.
The maximum resolution for the MV540 is 1024X768 @60Hz refresh. The other monitor isn't giving you an error message because not all monitors have that feature, but both the monitors are unable to display whatever data the computer is sending. If the display is normal until you start the game, then the game itself is setting the resolution to something out of the monitors' range. You'd need to set the game up to play at a setting the monitors could handle. I've never played WoW so I have no idea if the game offers a way of selecting the resolution. The game may simply require more graphics capability than your monitor can provide. Most systems now are using 17 or 19-inch flat screens or CRT's, and they offer more resolution and refresh rate options.
Most commonly, this problem is caused by an incorrect refresh rate setting. LCD monitors typically DO NOT support refresh rates higher than 60hz - and this is no exception. Try running the game in "safe mode" if it has one. Adjusting the in-game video settings should solve the problem, just look for a screen refresh rate or any video-related setting with a number followed by "hz". Set it to 60, everything should be fine.
It could also be that at some point the game changes resolution (this frequently occurs if there is an in-game movie or cut-scene). In this case the resolution settings for the in-game movie might be at fault, check them if you can.
It sounds to me like the monitor's refresh rate is too low to support your current settings, and the demands of the game. Have you tried adjusting the refresh rate? If I'm right, you should be able to fix the wavy lines that way. I'm not sure how much control over the refresh rate the game takes, but if you can fix the wavy lines and the game still doesn't work, I think you're not likely to get the game to work on this monitor.